We propose a longitudinal spin-Seebeck effect (SSE), in which a magnon-induced spin current is injected parallel to a temperature gradient from a ferromagnet into an attached paramagnetic metal. The longitudinal SSE is measured in a simple and versatile system composed of a ferrimagnetic insulator slab and a Pt film by means of the inverse spin-Hall effect. The experimental results highlight the intriguing character of the longitudinal SSE due to its own geometric configuration.
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This condition follows from a simple relation with the exchange integral and the bandwidth , since and with and being the lattice constant and the difference of the lattice displacement between the neighboring sites.
25.
The spatial distributions of the effective magnon and phonon temperatures, and , in the YIG layer in the present longitudinal setup are same as those in the conventional setup (Ref. 21). In the longitudinal setup, although the actual (observable) temperature in the Pt layer is lower than that in the YIG slab, in Pt may be modulated by a heat current flowing into the Pt layer due to the strong electron-phonon interaction.
© 2010 American Institute of Physics.
2010
American Institute of Physics
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